Originally Posted by ultramarina
And now they have moved back down to 7th grade math for a long unit and she's getting 100% on everything. That makes me feel really doubtful about moving her down a track. So, where do we place a child who is underchallenged by a math curriculum 1 year ahead but struggling in a curriculum 2 years ahead?

Hire a competent tutor to get her ramped up for the curriculum 2 years ahead.